(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Chaos Construction: Region Sums by KNT (on 7. April 2022, 20:42) | 64 |  97 % |
| Chaos: Killer by lerroyy (on 11. April 2022, 20:42) | 49 | 98 % |
| Shadow by TotallyNormalCat (on 4. July 2022, 14:00) | 41 | 98 % |
| Three Kings Go Horse Riding by Scruffamudda (on 15. August 2022, 02:19) | 18 | 93 % |
| Killer Quads by RockyRoer (on 19. September 2022, 03:14) | 47 | 100 % |
| Anti-Arrow by Eclectic_Hoosier (on 12. October 2022, 06:28) | 16 | 93 % |
| The Lonely White Dot by XeonRisq (on 14. December 2022, 21:00) | 53 | 96 % |
| Parasite by XeonRisq (on 10. March 2023, 17:00) | 27 | 93 % |
| Caged Knights Versus The Archers by Jeet Sampat (on 16. May 2023, 18:33) | 41 | 97 % |
| Sea Level Rise Sudoku by MagnusJosefsson (on 31. March 2024, 18:58) | 18 | 98 % |
| Orbicular by egubachu (on 12. May 2024, 20:37) | 17 | 93 % |
| Repeat Prescription by Jay Dyer (on 21. July 2024, 00:11) | 51 | 97 % |
| U-Bahn with Fillomino enclosures #3 (12x12) by Jesper (on 10. November 2024, 13:37) | 29 | 99 % |
| Turbulence (Coordinate Arrows) by Sotehr (on 3. July 2025, 14:00) | 26 | 93 % |
| Schadenfreude by Andrewsarchus (on 11. September 2025, 23:51) | 11 | 100 % |
| Roller Coaster mit Extras 5 by Uhu (on 11. March 2018, 13:50) | 61 | 99 % |
| Leapfrog by jovi_al (on 9. April 2022, 00:30) | 66 | 96 % |
| Ballast by wooferzfg (on 29. July 2023, 23:07) | 35 | 100 % |
| Team Sum Sudoku by Phistomefel (on 7. May 2024, 19:32) | 88 | 97 % |
| Peristaltikmaschine (Chaos Construction) by glum_hippo (on 21. March 2025, 12:32) | 72 | 98 % |
